If you made a repair disk in Windows 7 prior to this, you can then use this disk to access the system restore program on this disk and restore to any of your profiles stored on your hard drive. If not then you need to access your recovery partition and choose repair from there and you will also be able to do a system restore from the recovery partition (do not choose factory restore unless you have backed up your files to an external drive or you will loose them). Check your manual for access procedure to access your recovery console.

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